People seeking clues about how soon the Supreme Court might weigh in on states' gay marriage bans should pay close attention to the 6th Circuit Court of Appeals, Justice Ruth Bader Ginsburg told a Minnesota audience Tuesday.

Attorneys for three Utah gay and lesbian couples formally asked the U.S. Supreme Court on Thursday to take Utah's appeal of a favorable same-sex marriage ruling, following through on what they said they would do earlier this month.

In an interview with ABC News' "This Week" on Sunday, U.S. Attorney General Eric Holder stated that the Justice Department will urge the U.S. Supreme Court to uphold a lower-court rulings overturning statewide bans on same-sex marriage.